<div dir="ltr"><div>Hi all</div><div>As a Wandersearch responder (i.e. someone who goes out with a directional receiver and tries to locate the small transmitter pendants worn by people who tend to go wandering e.g. dementia patients), I am looking at using a Software Defined Radio (SDR) to receive these signals. However as the signals are weak, I am looking for ways of extracting the short transmitted pulses (around 100-200 milliseconds of unmodulated carrier) from the background noise using narrow band filtering. The problem is that the exact transmitter frequency is not known due to tolerances, temperature changes etc.</div><div>If anyone familiar with SDRs would like a challenge to combat boredom, any help would be appreciated.</div><div>Trevor</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Mar 22, 2020 at 11:28 AM Mark Atherton <<a href="mailto:markaren1@xtra.co.nz">markaren1@xtra.co.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">One more time, this go includes the Robotics group in the to: list :)<br>
<br>
<br>
Greetings Robotters.<br>
<br>
<br>
This is more of a brain-dump than anything too coherent; please <br>
contribute ideas as required.<br>
<br>
The next few weeks are going to be rather interesting to say the least, <br>
and while some of us relish the thought of time alone, others may be <br>
concerned about boredom creeping in.<br>
<br>
Spare time, does of course mean opportunity, and with a little planning, <br>
things can be done, plates can be spun, and progress can be made.<br>
<br>
Things that come to mind include the following:<br>
<br>
Develop. Something rattling around in your head for a while and needs <br>
implementing, is it time to get out the soldering <br>
iron/keyboard/angle-grinder and get going on it ?<br>
<br>
Repair. Broken things tend to accumulate. Not sure how to repair it - <br>
ask here, or find a specialist forum.<br>
<br>
Clear out. Sinking in it ? Round it up, and chuck it out.<br>
<br>
Document. Surrounded by lots of interesting complete projects, but <br>
little published work ? Maybe it's time to open a hackaday account, and <br>
start reporting your progress and projects to the world ?<br>
<br>
Learn. Stuff you are interested in ? Find a forum, an online resource, <br>
youtube - get stuck in. Not sure what the question is ? Ask here, we may <br>
know what you are trying to do and give some ideas about how to find <br>
required resources.<br>
<br>
Educate. Time to give back ? Maybe find a forum who could do with a <br>
mentor. Contribute.<br>
<br>
Stock up. Not sure how long the electronic component suppliers are going <br>
to be open for, so maybe it's time to pay a visit to Jaycar/South Island <br>
Components/Ecotech/Molten Media and load up with stuff while they are <br>
open. They may have to close for a while, and an acute widget shortage <br>
can be frustrating.<br>
<br>
Share. I hate that phrase, but in this context, you may have stuff <br>
surplus which may be useful to others. Give to the other givers first ?<br>
<br>
Scrounge. If you have a specific project in mind (not just stocking up) <br>
put out a Request-For-Scrounge (RFS). You might be amazed what stuff <br>
people have squirrelled away.<br>
<br>
As usual, lurkers, and regulars alike, please speak up about projects, <br>
ideas etc. Please keep the subject line of messages updated to track <br>
content.<br>
<br>
Things will return to some kind of normal over the next few weeks, but <br>
busy hands, fingers and keyboards can alleviate the stress of change.<br>
<br>
Comments, updates, and suggestions as usual are always welcome.<br>
<br>
Keep safe.<br>
<br>
-Mark<br>
<br>
PS I have copied a few non-robot-group members who seem relevant to this <br>
topic. Please sign up to be included in any of our discussions via <br>
<a href="http://kiwibots.org" rel="noreferrer" target="_blank">kiwibots.org</a> or directly at <br>
<a href="https://lists.ourshack.com/mailman/listinfo/chchrobotics" rel="noreferrer" target="_blank">https://lists.ourshack.com/mailman/listinfo/chchrobotics</a> As a (nearly) <br>
French person once said "I will say this only once"<br>
<br>
<br>
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